[zbrozek]

The GPSDO will also give you correct time of day and unwavering frequency. I used to have one set up at home to feed my test equipment a 10 MHz reference.

[ilyt]

If you're powering 50/60Hz clock you won't be setting time remotely on that easily

[chromoblob]

But how do GPSDO work? Is GPSDO susceptible to metastability?

[zbrozek]

GPS is a system for distributing time first and a means of computing position second.

A GPSDO is typically a PLL that uses the recovered timebase as a reference input and will have an incredibly slow loop filter. It can be outrageously highly damped and stable.

Such clocks are the basis of the cell network and have made doing client handoff between towers almost easy. The hard part is operating through GPS denial (mostly due to weather).